Here is my android controlled arduino project. A simple app sends data through SPP over bluetooth and switches an LED on and off.

The circuit is just a bluetooth module, arduino UNO, LED, resistor and some wires.

The LED can be switched on using buttons as well as voice activation (anything that contains the word 'on','off' or 'blink' - so saying 'turn the LED on' works as well as just uttering 'on'). I created the app using MIT app inventor and this project was created pretty much only to show how easy it is to write custom apps using the tool and interface with microcotrollers in this manner. One could use MIT app inventor to add more more features, such as using accelerometer or GPS data to control the LED, switching the state using text messages, web communication, not only send but also receive data, etc....well the point is - MIT app inventor is pretty cool and you should check it out

VIDEO OF IT -> http://youtu.be/41MRGjdVIMQ

Here is the app for download -> http://speedy.sh/63Q9N/bluetoothforarduino-app-2.apk

and here is the source, you can upload it to MIT's app inventor and modify as much as you want to -> http://speedy.sh/mDyAk/bluetoothforarduino-app-1.zip

As I mentioned on hackaday it won't be the exact copy as I improved it to react not only to 'BLINK' command but also 'FLASH' and 'CYCLE'... done that just because google voice search usually returns 'pink' or even 'd#ck' instead of BLINK :-Dbut apart from that it's the same

Use a call bluetoothclient.receivetext and set th number of bytes to -1, which reads until delimiter byte is received.Mmake sure you set the delimiter byte - I used '13' which is carriage return... ohh you might find this useful -> http://www.asciitable.com/index/asciifull.gif

What's more, it's seems there is no serial timout implemented yet and the app freezes if it doesn't receive anything. To solve that I set up the app to first send a 1 byte number to the arduino, when arduino receives that it sends its data.

Here is an app I created to receive data from a 1 wire temperature sensor (ds18b20). I think if you upload it into the MIT app inventor you should be able to work this out and modify it.http://speedy.sh/qscGe/bluetoothforarduino-app-temperaturereadings-1.zip

What's more, it's seems there is no serial timout implemented yet and the app freezes if it doesn't receive anything. To solve that I set up the app to first send a 1 byte number to the arduino, when arduino receives that it sends its data.

I wonder if you have to test for bytes available? In the Arduino it would be a test like if(Serial.available()){ Serial.read } .

In the code blocks you have a something that says BluetoothClient1BytesAvailableToReceive.............I think it should be combined with a if > 0 { read the byte }....or something like that.

P.S. I am tring to adapt your code to my purpose and I am learning while making the attempt.

I wonder if you have to test for bytes available? In the Arduino it would be a test like if(Serial.available()){ Serial.read } .

In the code blocks you have a something that says BluetoothClient1BytesAvailableToReceive.............I think it should be combined with a if > 0 { read the byte }....or something like that.

Well yeah, but you can't have (Serial.available()){ Serial.read } all by itself - meaning the control structure block has to be attached to something else - ideally it should happen with no user input. The only thing I can think of is to have it inside Clock.timer block and set it to fire every 10 ms or so. That's not ideal but it might work.

I had had some problems when I tried to implement it. Though the idea might be ok. I might have messed up something else - it is possible I sent data more often than the app received them and that freezed the app because of the buffer. Well at least that's my understanding of it

it's a BTM222 module on a custom breakout board - kind of cool because it is a class 1 device - so the max range is not 10m but 100m I bought it from a local tinkerer who makes them - so I don't think you'd be able to get it

Though there are lots of such boards all over ebay - though most of them are class 2 (range ~10meter)

I had had some problems when I tried to implement it. Though the idea might be ok. I might have messed up something else - it is possible I sent data more often than the app received them and that freezed the app because of the buffer. Well at least that's my understanding of it

I kept getting the same thing, its quite frustrating as my phone takes forever to recover! In my arduino code I just had Serial.println(...) in the loop and had my app to receive text every 1 second (with delimiter byte set to 13). I either get some odd values or it just crashes.